Subaru LEGACY 2006 Manual page 3581

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Step
7 CHECK OUTPUT SIGNAL OF TCM.
1) Lift-up the vehicle and support with rigid
racks.
NOTE:
Raise all wheels off floor.
2) Start the engine.
3) Shift the select lever to "D" range and
slowly increase vehicle speed to 20 km/h (12
MPH).
NOTE:
The speed difference between front and rear
wheels may light the ABS warning light, but this
does not indicate a malfunction. When AT con-
trol diagnosis is finished, perform the VDC
memory clearance procedure of on-board diag-
nostics system. <Ref. to VDC(diag)-20, CLEAR
MEMORY MODE, OPERATION, Subaru Se-
lect Monitor.>
4) Measure the voltage between TCM and
chassis ground.
Connector & terminal
(B55) No. 15 (+) — Chassis ground (–):
8 CHECK POOR CONTACT.
Check
Is the voltage less than 1 V?
Is there poor contact in the
reverse inhibitor control circuit?
5AT(diag)-88
Yes No
Even if the SPORT Go to step 8.
indicator light up,
the circuit has
returned to nor-
mal condition at
this time. A tempo-
rary poor contact
of connector or
harness may be
the cause. Repair
the harness or
connector in the
reverse inhibitor
control circuit.
Repair the poor Replace the TCM.
contact. <Ref. to 5AT-56,
Transmission Con-
trol Module
(TCM).>